Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a catalog of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, settled in USDC on the Base network, with no API keys, no rate limits, and no commitments required.
The specific endpoint `/api/v1/payments/31` is labeled "Premium API Access" in the x402 challenge but lacks further documentation about what data or functionality it returns. The x402 challenge confirms it is live, accepts POST requests, and requires a payment of up to 20,000 base units of USDC (0.02 USD) on Base (asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The response MIME type is application/json. The platform's docs, pricing, and API pages all appear to be behind a wallet-connect gate, so no detailed schema or example responses are available from the crawl.
Without additional documentation, the exact input parameters and response schema for this particular endpoint remain unknown. The platform advertises a broad set of sibling endpoints (sentiment analysis, text summarization, price feeds, geocoding, etc.), all at the same price point, suggesting a unified low-cost API marketplace. Agents should be aware that the specific functionality behind `/api/v1/payments/31` is not clearly documented.
Capabilities
Use cases
- —Accessing premium API functionality with per-request USDC micropayments on Base
- —Integrating pay-as-you-go API calls into agent workflows without API key management
- —Testing x402 payment protocol integrations against a live endpoint
Fit
Best for
- —Developers exploring x402 payment protocol
- —Agents needing keyless, pay-per-call API access
- —Low-volume or sporadic API consumers who want no commitments
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Anyone unable to settle payments in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/payments/31 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Example
Request
{
"url": "https://lowpaymentfee.com/api/v1/payments/31",
"body": {},
"method": "POST",
"headers": {
"X-PAYMENT": "<x402-payment-token>",
"Content-Type": "application/json"
}
}Endpoint
Quality
The x402 challenge is live and confirms pricing and payment details, but the endpoint's actual functionality is undocumented. No OpenAPI schema, no example responses, and all doc pages are gated behind wallet-connect with no content. The label 'Premium API Access' is generic and uninformative.
Warnings
- —The specific functionality of /api/v1/payments/31 is not documented anywhere in the crawled material.
- —All documentation, pricing, and API pages beyond the landing page are behind a wallet-connect gate and returned no useful content.
- —No OpenAPI spec or response schema is available; input parameters are unknown.
- —The endpoint path '/api/v1/payments/31' does not match any of the advertised API categories on the landing page, making its purpose unclear.
Citations
- —The endpoint returns a 402 challenge requiring USDC payment of up to 20,000 base units (0.02 USD) on Base network.https://lowpaymentfee.com/api/v1/payments/31
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.https://lowpaymentfee.com/api/v1/payments/31
- —The platform offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories.https://lowpaymentfee.com